Galaxy coach Bruce Arena suspended one game by MLS

Galaxy coach Bruce Arena was suspended for one game by Major League Soccer on Friday after the league’s disciplinary committee determined he left the technical area to argue a call in a 1-0 loss to Portland last week.

Arena, along with several Galaxy players, protested a linesman’s ruling of offside that wiped out an apparent tying goal by Robbie Keane in injury time.

Arena will not be allowed on the field Sunday when the Galaxy meet rival Chivas USA at the StubHub Center.

“I really have no comment on that. I’m going to save that for my book,” Arena said after Friday’s practice. “Really, the best thing is to say ‘no comment’ at this point. You should probably look at it yourselves and make your own decisions.”

Video replays of the incident show Keane and Landon Donovan arguing with assistant referee Eric Boria. Moments later, Arena was walking along the sideline pleading his case to the official.

Friday, he refused to talk about the incident.

“There will be a time and place for me to discuss that with the right people,” Arena said. “In my view, these things are never personal, they shouldn’t be. ... Listen, to the letter of the law, who can argue? We’ll leave it at that.”

Associate head coach Dave Sarachan will lead the Galaxy from the sideline against Chivas.

“Doesn’t change,” Sarachan said of the coaching adjustment. “The work’s been done this week. We make too big a deal out of this stuff sometimes. Who’s on the sideline — it’s not like in basketball where plays are being called out every three minutes, two minutes, one minute. It’s a whole different animal.

“We’ve had a great week of training and now it’s up to the guys. We’re well prepared and have assessed what we need to do against Chivas and we’ll perform on Sunday.”